Södermanland Runic Inscription 178 or Sö 178 is the Rundata catalog number for a Viking Age memorial runestone which is located at Gripsholm Castle, Södermanland County, Sweden, which is in the historic province of Södermanland.

The Ingvar runestones is the name of around 26 Varangian Runestones that were raised in commemoration of those who died in the Swedish Viking expedition to the Caspian Sea of Ingvar the Far-Travelled.